The problem of adding Notepad++ to the list of default programs...browsing

I have a question. Why can’t the Executive put the file in the default program?
Show him the root directory of the directory containing the program executable file but it still doesn’t add Notepad++ in the list of programs by default…
Previously, everything worked like clockwork!..
OS version Windows 7 SP1 x64
the version of Notepad++ 7.3.3